// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
#define UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_

#include "base/macros.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/views/controls/scrollbar/base_scroll_bar.h"

namespace views {

// The transparent scrollbar which overlays its contents.
class VIEWS_EXPORT OverlayScrollBar : public BaseScrollBar {
public:
    explicit OverlayScrollBar(bool horizontal);
    ~OverlayScrollBar() override;

protected:
    // BaseScrollBar overrides:
    gfx::Rect GetTrackBounds() const override;
    void OnGestureEvent(ui::GestureEvent* event) override;

    // ScrollBar overrides:
    int GetLayoutSize() const override;
    int GetContentOverlapSize() const override;
    void OnMouseEnteredScrollView(const ui::MouseEvent& event) override;
    void OnMouseExitedScrollView(const ui::MouseEvent& event) override;

    // View overrides:
    gfx::Size GetPreferredSize() const override;
    void Layout() override;
    void OnPaint(gfx::Canvas* canvas) override;

private:
    gfx::SlideAnimation animation_;
    DISALLOW_COPY_AND_ASSIGN(OverlayScrollBar);
};

} // namespace views

#endif // UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
